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The ADG738 and ADG739 are CMOS analog matrix switches with a serially-controlled 3-wire interface. The ADG738 is an 8-channel matrix switch, while the ADG739 is a dual 4-channel matrix switch. On resistance is closely matched between switches and very flat over the full signal range.
The ADG738 and ADG739 utilize a 3-wire serial interface that is compatible with SPI™, QSPI™, MICROWIRE™, and some DSP interface standards. The output of the shift register DOUT enables a number of these parts to be daisy-chained. On power-up, the internal shift register contains all zeros and all switches are in the OFF state.
Each switch conducts equally well in both directions when on, making these parts suitable for both multiplexing and demultiplexing applications. As each switch is turned on or off by a separate bit, these parts can also be configured as a type of switch array, where any, all, or none of the eight switches may be closed at any time. The input signal range extends to the supply rails.
All channels exhibit break-before-make switching action, preventing momentary shorting when switching channels.
The ADG738 and ADG739 are available in 16-lead TSSOP packages.
ADG738 Maximum Ratings
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V Analog, Digital Inputs2 . . . . . . . . . 0.3 V to VDD + 0.3 V or 30 mA, Whichever Occurs First Peak Current, S or D . . . . . . . . . . . . . . . . . . . . . . . . 100 mA (Pulsed at 1 ms, 10% Duty Cycle max) Continuous Current, Each S . . . . . . . . . . . . . . . . . .. . 30 mA Continuous Current D, ADG739 . . . . . . . . . . . . . . . . . 80 mA Continuous Current D, ADG738 . . . . . . . . . . . . . . . . 120 mA Operating Temperature Range Industrial (B Version) . . . . . . . . . . . . . . . . .40°C to +85°C Storage Temperature Range . . . . . . . . . . 65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . 150°C TSSOP Package JA Thermal Impedance . . . . . . . . . . . . . . . . . . 150.4°C/W JC Thermal Impedance . . . . . . . . . . . . . . . . . . . 27.6°C/W Lead Temperature, Soldering (10 seconds) . . . . . . .. 300°C IR Reflow, Peak Temperature . . . . . . . . . . . . . . . . . . 220°C
NOTES 1Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Only one absolute maximum rating may be applied at any one time. 2Overvoltages at IN, S or D will be clamped by internal diodes. Current should be limited to the maximum ratings given.
ADG738 Features
` 3-Wire Serial Interface ` 2.7 V to 5.5 V Single Supply ` 2.5 On Resistance ` 0.75 On-Resistance Flatness ` 100 pA Leakage Currents ` Single 8-to-1 Multiplexer ADG738 ` Dual 4-to-1 Multiplexer ADG739 ` Power-On Reset ` TTL/CMOS-Compatible
ADG738 Typical Application
· Data Acquisition Systems · Communication Systems · Relay Replacement · Audio and Video Switching